Contents: Primary control ⇊ Oil Leak Diagnosis ⇊ Leaks through gaskets ⇊ Leaks through seals ⇊ Leaks in the hull ⇊ Liquid leaking through ventilation…⇊
Note: Poor automatic transmission performance can be caused by five main reasons: poor engine performance, insufficiently precise adjustments, hydraulic faults, mechanical damage and computer failures. Diagnostics should always begin with checking the fluid level and condition (see Chapter 1), traction systems and their adjustments. After checking the adjustments, conduct a test drive to determine the need for further work, which must be carried out at a service station.
Primary control
1. Warm up the box to operating temperature.
2. Check the oil level in the gearbox (see Chapter 1).
- a) if the level is low, add oil;
- b) if the level is high, drain the excess, check the drained fluid for water. The presence of water in the gearbox oil indicates a malfunction of the radiator walls (see Chapter 3);
- c) If the oil is foamy, drain it and fill the box with fresh oil. Check for water in the oil.
3. Adjust the engine idle speed.
4. Check the valve cable for free movement. Adjust the cable if necessary (see Section 3). Check the ease of movement of the cable only on a warm engine.
5. Check the shift cable (see Section 4). Make sure it is adjusted correctly and the rods operate smoothly.
Oil Leak Diagnosis
6. Most leaks are easy to spot visually. Repairs usually involve replacing seals and gaskets. If leaks are difficult to spot, follow these tips.
7. Remember that automatic transmission fluid is usually red. Do not use motor oil.
8. Drive the car for a few kilometers. Place a large, clean piece of cardboard under the car. After one or two minutes, you should be able to see the leaks by the prints on the cardboard.
9. Carefully inspect the suspected leak site.
10. If the leak is still not found, thoroughly rinse and dry the surfaces.
11. Drive a few kilometers again to warm up the gearbox and repeat the search procedure.
12. Once the leak has been located, determine the cause of the leak and fix it: for example, if a flange is bent, installing a new gasket will not help.
Leaks through gaskets
13. Periodically inspect the oil pan. Make sure the bolts are tight and the gasket is in good condition.
14. Causes of oil pan gasket leak: high oil level, high oil pressure, clogged vent, oil pan mounting bolts are too tight, oil pan flange is warped, drive axle connection surfaces are damaged, gasket is damaged. If sealant was used instead of a gasket and there is an oil leak, then this type of sealant is not suitable.
Leaks through seals
15. Leaks through seals are usually caused by too high oil level or pressure, blocked ventilation, damaged seal fit or improper installation. The shaft sealing surface may be damaged or bearings may be broken, leading to excessive relative movement of the shaft and seal.
16. Make sure the dipstick tube is seated properly and that the seal on the dipstick cap is present. Periodically inspect the area around the speedometer drive mount and sensors.
Leaks in the hull
17. If leaks appear in the body, then there are pores or cracks in the casting - repair or replacement is required.
18. Check the integrity of the hoses and their connections on the box and radiator.
Liquid leaking through ventilation and filling pipe
19. If this defect occurs, it is due to the ingress of engine coolant, improper installation of the gearbox ventilation system and drain holes.
(The article is based on information from the website «HondaBook.ru»)